问题标题：
Ifyoureallywantyourselftobeingoodhealth,youmust____always____somuch.A.notbesmokingB.nothavesmokedC.nottosmokeD.benotsmoking我选的是D,详细说说……小弟感激不尽……
问题描述：
Ifyoureallywantyourselftobeingoodhealth,youmust____always____somuch.
A.notbesmoking
B.nothavesmoked
C.nottosmoke
D.benotsmoking
我选的是D,
详细说说……小弟感激不尽……
黄可回答：
这道题你的问题在于情态动词的用法没掌握好.
情态动词有can(could),may(might),must,haveto,shall(should,will(would),dare(dared),need(needed),oughtto等.
它们的用法就是：肯定：情态动词+be
否定：情态动词+notbe
此题只是使用了情态动词的否定用法和动词ing表状态延续的用法.
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